Simplify 3(2x+4y-y) i need help with that please

What is 100,000 times 1/100,000, using the standard method of multiplication? write the answer as 10 to a power.

What is the sum of these mixed numbers 4 2/3+ 3 1/9

Asix-sided die of unknown bias is rolled 20 times, and the number 3 comes up 6 times. in the next three rounds (the die is rolled 20 times in each round), the number 3 comes up 6 times, 5 times, and 7 times. the experimental probability of rolling a 3 is 10 %, which is approximately % more than its theoretical probability. (round off your answers to the nearest integer.)